Spongy brake pedal feel .

[combine]

Don't seem to be short of fluid as container is full , none dribbling out of rubber at top of pedal housing either ! Is it air getting in somwhere . If I pump pedal it tightens up nicely only to go back again .

Edited by combine on Monday 16th June 20:35

[Gandalf]

Dont drive in flip flops

[blaineuk]

probably need the brake fluid changing, have you been working the brakes hard?

[adam quantrill]

Or clogs!

Mine was doing that a while back, turned out to be the master cylinder, I was pumping air in faster than I could bleed it out.

[combine]

Sounds like the master cylinder could be nackered then , possibly due to the car sitting around in garages for too many years .

[mikeb]

Boiled 'yer brakes lately?? Fluid change??

MikeyB

[TVRleigh_BBWR]

Yes, I boiled my fluid Sunday, now I have a spongy brakes, was very firm before.

[combine]

Thats one possible thats been mentioned but apparently it is more likely to be a sticking brake piston , anyway she's ok to drive for the moment till the MOT.

[Toltec]

On a similar subject (and a slight hijack ) we replaced the seals and the brakes felt great, until they cooled down, at which point there was a lot of pedal travel until the front brakes bit. It looks like the rear brake piston does not return all of the way (even when the M/C is unbolted from the servo) which means the hole to the reservoir is covered and as the fluid cools and contracts it is not replenished. Applying a pressure bleed kit gives you perfect braking again until you stop and cars cools down.

At least I think that is what is happening.

Apparently the original Girling M/C is not longer available but there is a Delphi equivalent, has anyone fitted one of these? Last time I used a Delphi equivalent for the clutch M/C I had to get an adaptor made up as the thread on the outlet was different to the original.

[dixiebabes]

combine said:

Don't seem to be short of fluid as container is full , none dribbling out of rubber at top of pedal housing either ! Is it air getting in somwhere . If I pump pedal it tightens up nicely only to go back again .

Edited by combine on Monday 16th June 20:35

exactly the same happened to me a couple of weeks ago and i nearly went into the back of a magnum type ferrari on a run out. Changed the brake fluid and bled the old stuff out seems to be ok now but i havent kicked its head in lately so might be just the same under some hard graft

regards dix

[combine]

Planning to go with a bunch a pistonheaders to the cambs. tvr meet this Thurs evening ( Adam Quantril's neck of the woods ) , so will find out how the brakes are .

[adam quantrill]

Is that at the White Swan? As it's only 4 miles from where I work I spose I have no excuse ;^)

What time does it start?

[GV]

Are these brakes princess 4 pots as they have a reputation for being hard to bleed.

[combine]

adam quantrill said:

Is that at the White Swan? As it's only 4 miles from where I work I spose I have no excuse ;^)

What time does it start?

We should be there around 7.30 - 7.45pm Thurs , see you there Adam ! Question , is there only one bleed screw on the back brakes as I can only find one on the passenger side . Bled them anyway and at present they are back to normal.

[blaineuk]

combine said:

adam quantrill said:

Is that at the White Swan? As it's only 4 miles from where I work I spose I have no excuse ;^)

What time does it start?

We should be there around 7.30 - 7.45pm Thurs , see you there Adam ! Question , is there only one bleed screw on the back brakes as I can only find one on the passenger side . Bled them anyway and at present they are back to normal.

yes

[combine]

Thanks for that Blaine , how's the rebuild going ?

[blaineuk]

finally got round to taking the chassis for repair today, engine bay primed reafy for paint, various new parte arriving, just need to order spring/shockers

[combine]

GV said:

Are these brakes princess 4 pots as they have a reputation for being hard to bleed.

The back brakes are Jag. the fronts on this monster are upgrades ie drilled four pot big brakes , not too bad to bleed .

[adam quantrill]

combine said:

adam quantrill said:

Is that at the White Swan? As it's only 4 miles from where I work I spose I have no excuse ;^)

What time does it start?

We should be there around 7.30 - 7.45pm Thurs , see you there Adam ! Question , is there only one bleed screw on the back brakes as I can only find one on the passenger side . Bled them anyway and at present they are back to normal.

You are lucky you have a bleed screw - mine snapped orf!

Yep - see you there - might even be sunny!

[combine]

Nice to meet up with you again Adam at the cambs meet , great weather , will buy you a drink at the fest , and don't forget the run out in the 400sx !